Other versions exist on this site from various publications. This one is from the Radio Electronics Experimenter from 1990. The bargraph circuit uses the UAA170.
This is a voltmeter with high input resistance. The transistor is germanium. We found it in an...
Found in old American documentation, the components used are still common. The circuit directly...
This circuit was found in an Electronics World magazine from 1990. The circuit can be mounted...